ATA6830-PKHW Atmel, ATA6830-PKHW Datasheet - Page 5

• Manufacturer Part Number: ATA6830-PKHW
• Description: Motor / Motion / Ignition Controllers & Drivers IC Automotive for Headlamp Adjustment
• Manufacturer: Atmel
• Type: 2 Phase Stepper Motor Driverr

Specifications of ATA6830-PKHW

• Product: Stepper Motor Controllers / Drivers
• Operating Supply Voltage: 7 V to 20 V
• Supply Current: 7 mA
• Mounting Style: SMD/SMT
• Package / Case: QFN-28
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

3.2
Figure 3-2.
4575D–BCD–09/05
BUS
Digital Part
Digital Blocks
VREF
Error Timer
Figure 3-2
mands via the bus input pin. An analog comparator is used as a level shifter at the input. There
is also a possibility of clamping the bus pin to ground. This will be used after detecting an error to
feedback this to the microcontroller.
The next block is a UART. Its task is clock recovery and data recognition of the incoming bit
stream. For clock recovery a special bitstream is used after each power on. The generated bit-
stream will be analyzed and after a correct parity check interpreted for execution.
A sophisticated cruise control generates all control signals for the two H-bridge drivers. It uses
an internal step-time table for accelerating and decelerating the stepping motor depending on
the actual and desired position and the temperature and voltage levels. Exception handling is
integrated to interpret and react on the temperature, supply voltage, and coil-current signals
from the analog part.
Reset
Clk
Error Signals
shows all digital blocks of the circuit. The stepping motor will be controlled by com-
Bitstream
Recovery
Recovery
Clock
UART
bitstream
shiftclk
rxd
Parity-Check
Recognition
Data
&
Voltage Levels
reference run
new position
Instantaneous Position
Maximum Step Time
Step Time Memory
Actual Step Time
Desired Position
New Step Time
Cruise Control
Stepper Motor Control
Temperature Signals
ATA6830
Error Signals
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